This realy falls under my "If I could find a venture capitalist..." new business ideas, but does anyone offer a service that will lease temporary server capacity and bandwidth for event-related sites?
If so, you could set up temporary mirrors for MacWorld, big software releases like OSX and stuff like that and then not have to invest in server farms that would go unused 80% of the time.
I can see how a service like this would work for the Superbowl, the Oscars, The Olympics and other big events that need bandwidth and servers for a month or so and that's really it.